Alternating-current motor.



Vi A, FYNN ALTERNATING CURRENT MOTOR.

APPLIOAEEION FILED MAIL. s. 1909.

946,5Q5. Patented Jan. 12, law.

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1 Regula,tin g Dvice i 2 l v i 4:8 /Regu1a ing Device Fin 2.

Regulating Device INL ENTOR wmvzssgs;

Valera A. Fynn ceases.

UNITED" STATES PATENT orrion.

VALERE ALFRED FYNN, OF LONDON,- ENGLAND. I

ALTERNATING CUBRENT MOTOR.

Specification of Letters Patent.

Patented Jam-11, 1910.

original application filed December 21, 190 6, SerialN-o. 348,907. Divided and this'applieation filed March 6, 1909. Serial No. 481,764. i

To all whomit may concern:

Be it known that I. VALicnE ALFRED Fr ar, a subject of the King of England, residing at London, England, have invented a certain new and useful Alternating-Gurrent Motor, of which the following is such a full, clear, and exact description as will enable any one skilled in the art to which it appertains to make and use the same reference being had to the accompanying drawings, forming part of this specification.

tion and in which the E. M. F. responsible for the motor field is at least partly generated in the motor itself.

The object of my invention is to, improve or control the power factor of the said type of motor. I

In other s ecifications I have disclosed means for ac iieving this purpose by con ductively introducing a compensating E. M. F. into the exciting circuit; according to the present nvention I achieve the same purpose by suitably adjusting the phase of that teaser or transformer held by rotation in which the exclting E. M. F. is generated in the rotor conductors of the motor.

Referring to the drawings Figure 1 shows diagrammatically the general method by which I varythe phase of the teaser field; Fig. 2 shows how the phase of 'the teaser field can be varied with the helpof an E. M. F. derived from the motor itself.

In Fig. 1 the working circuit comprising the neutralizing winding 21 and the commuted windin 16 is connected to the mains 1, 2 by way 0? some known and convenient M itself. Such a transiormercan, of course, be

form of regulating device indicated at 43. Therotor ampere turns doing duty as working ampere turns are comprised between the the one side and 24. 26 on the other. They are neutralized by the stator winding 21 connected in series relathe working turns on the rotor A teaser winding and contion with and in opposition to them. 19 is also disposed on the stator May nected in parallel tothe supply. Some regulating device can be inserted in this circuit as indicated at 44 whereby the E. M. F. im pressed on 19 from the mains canbe, regulated. The brushes are so disposed as to short-circuit at least part of the commuted winding 16 along an axis displaced from that of the winding 19. In Fig. 1 the parts of 16 between the brushes 23, 2a on one side and 25, 26 on the other are short-circuited. The exciting E. M. F. for this motor is generated in the rotor itself by rotation of the rotor conductors in the teaser field. The

exciting current flows in those parts of 16 which are short-circuited by the brushes. Fig. 1 is one form of the novel motor dis closed in some of my concurrent applications but the present invention is applicable to any form of said motors.

For the purpose of this invention 1 impress on the teaser winding two E. M. FPS differing in phase preferably by about 90 degrees and i vary the magnitude of one or of both of these E. M. F.s thus varying the phase of the teaser flux and consequently also the phase of the resultant M. F. in the exciting circuit thereby controlling the power factor of the motor. In Fig. 1 one of the M. Ffs impressed on 19 is derived from the mains and has already'been referred to. The other is derived from mains i0, -11 by way of the variable ratio trans- "Former 39. The mains 40 4'1 can be connected to any desired source generatingan E. M. F. (littering in phase from that impressed on the mains 1, 2. The magnitude of this auxiliary E. M. F. can be controlled at 18.

The general arrangement of Fig. 2 only (litters from the previous in that the brushes are .difiercntly disposed in relation to the commuted winding 16. The auxiliary E. M. F. is here also derived from a transformer which can be of the variable ratio tvpc but the latter is embodied in the motor of the two-coil or ofthe one-coil type. The primary of this transformer is constituted by the exciting winding of the motor shown n Fig. 2, its secondary by the winding 42 disposed on the stator along an axis displaced from that of the neutralizing Winding 21 preferably by about 180/11 degrees, where n stands for the number of poles of the machine.

ion

ived from the mains.

i l l I This motor field, therefore, induces in 42 an E. Iii. F. the phase of which is practically in quadrature witn that derived from the mains l, 2. This l3. iii. F. is therefore suitable for my purpose and can be regulated auce at 18, thus controlling the power of the motor.

i a. vin g tally described my invention, what claim new and ire. to secure by Letters Patent of the Unit/t States is:

l. in an alternating current motor, the combination with a stationary member prormed with a neutralizing winding, of a re volving member car r a conductively impressed working current along an coinciding with that of t neuhalizing winding and an exciting our it along an axis displaced from that oi me neutralizing winding, means for producing a teaser flux along a XiS coinciding with that of the neutralizing winding, and means for varying the phase of said teaser flux.

2. in an alternating current motor, the

combination with a stationary member provided with a neutralizing winding and a teaser \vinding, of a revolving member carrying a eonductively impressed working current aiong an axis coinciding with that of the neutralizing winding, and an exciting current along an axis displaced from that of the neutralizing winding, and means for impressing on said teaser winding an E. M. F. F

differing in phase from that of the supply.

3. In an alternating current motor, the combination with a stationary member provided with a neutralizing winding and a teaser winding, of a revolving member provided with a commuted winding connected in series relation with the neutralizing winding along an axis coinciding with the axis of said neutralizing Winding, an exciting circuit on the revolving member, and means for im nessing on said teaser winding an E. M. F. iliiiering in phase from that of the supply.

4. In an alternating current motor, the combination with a stationary member provided with a neutralizing windin and a teaser winding, of a revolving mem r pro- 3 vided with a commuted winding connected in series relation with the neutralizing winding along an axis coinciding with the axis of said neutralizing winding, an exciting circuit on the revolving member, means for impressing on said teaser winding an E. M. F. of approximately the same phase as that of the working E. M. F. and means for impressing on said teaser winding an E. M. F. differing in phase from that of the working E. M. F.

5. In an alternating current motor, the combination with a stationary member provided with a neutralizing winding and a. teaser winding. of a revolving member provided with a commuted winding connected in series relation with the neutralizing windin along an axis coinciding with the axis of said neutralizing winding, an exciting circuit on the revolving n'ember, and a variable ratio transformer in circuit with the teaser winding.

6. In an alternating current motor, the combination with a stationary member provided with a neutralizing winding and a teaser winding, of a revolvin member pro- .vided with a commuted winding connected in series relation with the neutralizing winding along an axis coinciding with the axis of said-neutralizing winding, an exciting circuit on the revolving member, an auxiliary winding on the stator disposed along an axis displaced from that of the neutralizing winding and connected in series with said teaser winding.

In witness whereof I have hereunto set my hand and aflixed my seal in the presence of two subscribing witnesses.

VALERIE ALFRED FYNN. [1,. s.]

\Vitnessels:

lV. A. Annxsnnnu, E. E. Hurrah-x27. 

